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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





B & W CDM 7SE

CDM 7SE

Floor-standing loudspeaker system


The CDM 7SE has an additional paper/Kevlar® bass driver which delivers a fast bass

response.

The technology has been advanced even further in the CDM 7SE. The bass units now

feature dispersion modifiers in the centre of the voice coils. Replacing the normal dust

caps, these improve dispersion in the mid frequencies and give better integration between

the drive units, resulting in greater detail and dynamics.

The crossover boards incorporate tweeter filters, maximising the benefits of bi-wiring. The

stunning aesthetics hide a simple fact that the panoramic, studio quality sound delivered by

these speakers is rarely equalled.

Technical highlights

Tweeter on top: B&W's Tweeter on top technology ensures that the sound

remains focused and time-sensitive and that the stereo-image is presented with

unparalleled three dimensional accuracy.

Kevlar®: B&W developed and patented the method of using Kevlar® for

loudspeaker cones to reduce unwanted standing waves. DuPont originally

created Kevlar® for use in bulletproof vests.

Description: 3-way 4th-order vented-box system

Drive units:

1x 165mm (6½ in) Paper/Kevlar®fibre cone bass

1x 165mm (6½in) woven Kevlar®cone bass/midrange

1x 26mm (1in) metal dome high-frequency

Frequency range: -6 dB at 30 Hz and 30 kHz

Frequency response: 40 Hz – 20kHz ± 3 dB on reference axis

Dispersion:

Within 2 dB of response on reference axis

Horizontal: over 40° arc

Vertical: over 10° arc

Sensitivity: 90 dB spl (2.83 V, 1 m)

Harmonic distortion: 2nd & 3rd harmonics < 1% 45 Hz – 20 kHz (90dB spl, 1 m)

Nominal impedance: 8 Ω (minimum 4 Ω)

Crossover frequencies: 150 Hz, 3 kHz

Power handling: 30 W – 150 W continuous into 8 Ω on unclipped programme

Max. recommended cable impedance: 0.2 Ω

Dimensions:

Height: 950 mm (37⅜ in)

Width: 220 mm (8⅝ in)

Depth: 290 mm (11⅜ in)

Net Weight: 18.5 kg (40.7 lb)

Finishes:

Cabinet: Real wood veneers of black ash, red ash or cherry.

Grille: Black cloth

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